PROCESS FOR PRODUCING A PRESSURE-SENSITIVE CARBONLESS COPY SHEET USING MICROCAPSULES FORMED IN SITU IN A RADIATION CURABLE BINDER

摘要

PROCESS FOR PRODUCING A PRESSURE-SENSITIVECARBONLESS COPY SHEET USING MICROCAPSULESFORMED IN SITU IN A RADIATION CURABLE BINDERYU-SUN LEE AND DALE R. SHACKLEAbstract of the DisclosureA process is provided for producing a coating composition containingmicrocapsules having a hydrophilic core material for use in the manufactureof pressure-sensitive carbonless transfer papers comprising the followingsteps of preparing a hydrophobic emulsion component by dispersing an emulsi-fier in a radiation curable hydrophobic liquid, preparing a hydrophilicemulsion component by dispersing a first wall-forming material in a hydro-philic liquid containing at least one chromogenic material being soluble inthe hydrophilic liquid, the first wall-forming material being reactive with asecond wall-forming material to form a polymeric capsule wall, the polymericcapsule wall being substantially insoluble in the hydrophilic and the hydro-phobic liquids and mixing the hydrophobic emulsion component with the hydro-philic emulsion component to form an emulsion containing droplets of the hydro-philic emulsion component dispersed in the hydrophobic emulsion component.The second wall-forming material is then added to the emulsion with agitation,the agitation continuing for a period of time sufficient to allow the firstand second wall-forming materials to react to form a dispersion of microcap-sules in the hydrophobic emulsion component, the microcapsules having cellwalls substantially impermeable to the hydrophobic and the hydrophilic liquids.A process is provided for producing a pressure-sensitive carbonless transferpaper comprising the further steps of applying the coating composition to asubstrate and curing the coating composition by subjecting the coating cort-position on the substrate to radiation for a period of time sufficient tocure the radiation curable hydrophobic liquid, thereby producing a tack-freeresinous film on the substrate. A novel coating composition is produced com-prising microcapsules having a hydrophilic core material dispersed in aradiation curable hydrophobic liquid. A pressure-sensitive carbonless trans-fer sheet is produced comprising a substrate having a plurality of surfaces,at least one of the surfaces being coated with a tack-free resinous film com-prising a radiation cured resin having dispersed therein microcapsules con-taining a hydrophilic liquid containing at least one chromogenic material,the chromogenic material being soluble in the hydrophilic liquid.